Friday, May 11, at 8 pm at the Knox Octagon Barn, 588 Middle Rd, Delanson, NY 12053, Albany County. Lecture: ALBERT EINSTEIN >100 Years of Special and General Relativity by Prof. Matt Szydagis (U Albany). Join us for an astronomy lesson and dark sky observing at the Octagon Barn in Delanson, NY! Programs include a 1 hour talk by local astronomy enthusiasts, followed by night sky observing if the weather is clear. Amateur astronomers and families are invited to bring binoculars or telescopes. Telescopes will also be set up for public use. Great for older children and adults! Free!

North Bethlehem Fire Department Annual Mother's Day plant sale on Friday, May 11 from 3 - 7 pm and Saturday, 8 am - 6 pm. Beautiful hanging baskets and potted plants perfect to brighten Mom's day and delight throughout the summer. North Bethlehem Firehouse, 589 Russell Rd, Albany, NY 12203.

Acoustic Doorways Concert - Connelly Akstens Trio. Friday, May 11, 7:00 pm at the First Reformed Church of Bethlehem 38 Church Road, Selkirk, NY. Tickets $10

The Stockade and its secrets come to life! Our guide will lead us from the museum, through the Stockade, and inside two Stockade homes, the historic Brouwer House. This tour lasts approximately three hours.

First Monday Spaghetti Dinner at Altamont Reformed Church, 129 Lincoln Avenue from 5 to 7 p.m. (Last seating at 6:30 p.m.)

All you can eat breakfast. American Legion Altamont Post 977. 988 Altamont Blvd. 8 a.m. to 11:30 a.m. 518-861-6848.

Knox Clean-Up Day. 9 a.m. to noon. Stop by transfer station to pick up your bags and receive instructions on how and where to pick up trash.

St. Matthew's Church, Voorheesville welcomes the Hilltown Players: presenting " Sketches & Skits from the Carol Burnett Show" on Sunday, May 6, at 3:00 pm.  $10 pp.. Contact: Peggy McQuade

Roast Pork Dinner on Saturday, May 5, served from 4 - 7 pm.  Take-outs also available. Includes Beverage & Dessert. Handicap Accessible. Adults & children 11 yrs & older $12., Kids 5 - 10 yrs old $6., Kids under 5 FREE.  Bethlehem Grange #137, 24 Bridge St (Rt 396 W), 1/10th mile from Rt 9 W, Selkirk, NY 12158   For more info: Call Carol Carpenter 518-421-1384.

‘I Love My Park Day,’ a stewardship event at the Five Rivers Environmental Education Center in Delmar, Albany County, from 10 a.m. to 1 p.m.